Bulls guard Rajon Rondo has been suspended one game for “conduct detrimental to the team,” the team announced Monday. Rondo will miss the Bulls' Monday night matchup with the Portland Trail Blazers at the United Center, and return to the court on Tuesday at Detroit.

Rajon Rondo — suspended for tonight's game — had a "heated exchange" with a Bulls assistant in Mavericks loss, sources tell @TheVertical.

Reports of an argument with the coaching staff aside, details were scarce about the cause of Rondo's suspension at the Bulls' Monday morning shootaround. Head coach Fred Hoiberg declined to go into specifics about what happened when asked repeatedly, saying only that he and Rondo had discussed the matter. Rondo attended a team charity function on Sunday.

“I’m not going to go into details about the situation, guys,” Hoiberg said. “The decision was made and we’re going to move forward.”

Jimmy Butler didn't share any details of the incident with Rondo, either, but he made it clear how much he values him as a teammate despite this episode.

“[Rondo]'s been great,” Butler said. “I think this is just another bump in the road. He's a phenomenal damn teammate and I back him on everything.”

While there were no previous signs of discord, it seemed like it was only a matter of time until the mercurial Rondo made headlines for something other than his play.

It was almost exactly one year ago that Rondo was ejected from a game and suspended for another after derogatory language toward referee Bill Kennedy, who days later revealed he is gay. Rondo issued a non-apology apology statement, and then a somewhat more sincere statement that actually included the word “sorry.”

Ten months before that, Rondo got into multiple arguments about play-calling with Dallas Mavericks coach Rick Carlisle during and after a game, and was suspended for one game. When the Bulls were in Dallas just two days ago, Carlisle, as well as teammate Taj Gibson, had nothing but praise for Rondo.

In 2012 with the Boston Celtics, Rondo was suspended two games for his part in an on-court fight with Brooklyn Nets players Gerald Wallace and Kris Humphries. Less than two months later, Rondo earned another one-game suspension for making contact with a referee, as well as failure to cooperate with a league investigation.

When the Bulls signed Rondo over the summer, they downplayed any concerns about his past behavior.

“Like with Rondo, there was very open dialogue over a couple of day period and we were very transparent with some of the background stuff,” general manager Gar Forman said at the time. “He was transparent in talking about it and at the end of the day he had a good understanding of what our expectations were and I think we had a good understanding of what his were.”

With Rondo out, Jerian Grant will start at point guard on Monday night against the Blazers. Grant also started against the Trail Blazers on Nov. 15 in Portland after Rondo suffered a sprained ankle, and excelled in his first start of the season, putting up 18 points and a career-high five steals.

Sean Highkin covers the Chicago Bulls and the NBA for The Athletic. He also co-hosts the Locked On Bulls podcast. Sean has previously written for Bleacher Report, USA Today, Sports On Earth and NBC Sports. Suivez Sean sur Twitter @highkin.